KR102262891B1 - Nozzle structure for 3D printer - Google Patents

Abstract

The present invention relates to a nozzle structure for a 3D printer, which comprises a nozzle in which a Teflon hose and a brass coupling tube are combined, and a supply member to which the nozzle is detachably coupled, but prevents the expansion of the tube by heat supplied from a heater block and is easy to exchange the nozzle. In addition, it is easy to exchange the nozzle and inserts the Teflon hose inside the brass coupling tube to prevent heat from being transferred to the Teflon hose, and thus the Teflon hose is prevented from expanding and bursting due to heat.

Description

Nozzle structure for 3D printer

The present invention relates to a nozzle structure for a 3D printer, and more particularly, a nozzle for a 3D printer that improves the occurrence of deterioration clogging and material expansion in a nozzle in which the nozzle and the Teflon hose are integrated, as well as the easy replacement of the nozzle It's about structure.

The technology for forming 3D structures includes a method of extruding and laminating thermoplastic plastics, projecting a laser beam into a vat containing a liquid 'photocurable resin', and making the sculptures in the tank layer by layer. Each time the tank descends as much as the thickness of the layer, and the laser is scanned again to form a three-dimensional structure, the resin is formed while projecting the light of the shape to be molded on the liquid 'photocurable resin (resin that hardens when exposed to light)'. There are various methods, such as a method of forming a three-dimensional structure by hardening layer by layer, and a method of forming a three-dimensional structure by extruding liquid color ink and a cured material (binder) from a nozzle of a printer head to a powder raw material using the principle of an inkjet printer. Among them, the method of extruding and laminating thermoplastic plastics completes a three-dimensional structure by laminating one and the same liquefied raw material (plastic, wax, metal, etc.) in a designated (target) range.

In the nozzle assembly using this technology method called Fused Filament Fabrication (FFF) or Fused Deposition Modeling (FDM), the raw material is supplied to the nozzle by the rotation of the roller, and the raw material is melted and extruded by high heat. However, in the conventional nozzle assembly, the deterioration and clogging phenomenon, that is, when the printing operation is continued for a long time, the high temperature heat required for melting the filament is applied not only to the temperature rise position but also to the filament insertion part, thereby preventing the filament melting and discharging and thus There is a problem that causes clogging of the nozzle. Therefore, according to the conventional apparatus, the melted filament comes out of the nozzle assembly due to deterioration and clogging when used for a long time, and the nozzle unit must be replaced after disassembling the entire apparatus for repair work.

As a prior document for solving the above problems, the "module separation type 3D printer raw material extrusion apparatus" of Korean Patent Laid-Open No. 10-2016-0128607 (published on October 13, 2016) is a module-separable 3D printer raw material extrusion apparatus in a cylindrical shape. A nozzle unit having a fastening structure and extruding a raw material; a pipe for providing a path connected to the cylindrical fastening structure of the nozzle unit to form a raw material supply path; and an anti-adhesion pipe inserted into the pipe for providing the path to prevent adhesion of the raw material in the pipe for providing the path, wherein the nozzle unit, the pipe for providing the path, and the pipe for preventing adhesion are each separable from each other, The anti-adhesion tube is characterized in that it is inserted into the lower portion of the tube for providing the path.

The above-mentioned prior literature discloses that the anti-attachment tube forms an inner wall of the route providing tube when mounted in the route providing tube and forms a route that helps the filament to be accurately injected into the nozzle unit together with the route providing tube, and at the same time, the filament forms a route. It is attached to the inner wall of the tube for provision and has a feature to prevent the flow of filaments from being disturbed.

However, in the above-mentioned prior literature, a gap occurs because perfect adhesion is not achieved when the tube for supply and the tube for adhesion prevention are combined, and the molten filament flows into the gap, and hardening occurs, so that a fixed amount of filament cannot be supplied. There is this.

In addition, there is a problem in that the supply path of the filament is blocked when the operation is stopped or the filament for supply is exchanged due to the phenomenon of the molten filament flowing into the gap between the supply tube and the adhesion prevention tube being hardened. .

Republic of Korea Patent Publication No. 10-2016-0128607 (published on October 13, 2016)

The present invention for solving the above problems is a 3D printer that facilitates nozzle replacement and prevents heat from being transferred to the Teflon hose by inserting a Teflon hose inside the brass coupling tube, thereby preventing the Teflon hose from expanding and bursting by heat. An object of the present invention is to provide a nozzle structure for

In addition, an object of the present invention is to provide a nozzle structure for a 3D printer that facilitates the coupling of the nozzle and the brass coupling pipe, and prevents the molten filament from flowing into the gap by preventing a gap between the nozzle and the brass coupling pipe. have.

In addition, an object of the present invention is to provide a nozzle structure for a 3D printer that allows the heat radiation cut from the heater block to be dissipated from the housing and the heater block together to prevent transmission to the Teflon hose through the brass coupling tube as much as possible.

The present invention is a means for achieving the above object,

A nozzle in which a Teflon hose and a brass coupling tube are combined; It provides a nozzle structure for a 3D printer, including a supply member to which the nozzle is detachably coupled, and which prevents the phenomenon of expansion and bursting by heat supplied from the heater block, as well as facilitating replacement of the nozzle.

The nozzle of the present invention comprises: a nozzle body for molding a molded article by melting a filament by the heat of a heater block; A brass coupling tube having a slanted contact surface and a Teflon hose coupled thereto so that there is no gap while the nozzle body is in full close contact; In order to prevent expansion of the tube by the heat transmitted from the heater block, the Teflon hose to which the filament is supplied by coupling only up to the step formed on the inside of the brass coupling tube; characterized in that it is configured to include.

In the supply member of the present invention, the first heat dissipation hole and the second heat dissipation hole are formed to prevent the Teflon hose from being expanded by the heat transferred from the heater block to prevent heat transfer to the Teflon hose as well as the nozzle. It is characterized in that it is easy to attach and detach.

'자 형상으로 이루어져 히터블럭의 상부쪽으로 연결되는 것을 특징으로 한다.The first heat dissipation hole of the present invention is provided in the housing and the heater block so that the heat dissipation cut from the heater block is made together in the housing and the heater block and is transmitted to the Teflon hose through the brass coupling tube as much as possible.

It is characterized in that it is made in a 'shape and is connected to the upper part of the heater block.

The present invention has the effect of preventing the phenomenon of the Teflon hose being expanded by heat and bursting because the transfer of excessive heat to the Teflon hose inserted inside the brass coupling tube is prevented.

In addition, since the present invention has an inclined contact surface formed at the lower part of the brass coupling pipe, the nozzle and the brass coupling pipe are coupled by screw coupling, so that a solid coupling is made. Therefore, a gap is generated between the conventional nozzle and the brass coupling pipe, and the molten filament is It is effective in resolving the problem that flows into the gap.

In addition, the present invention prevents the heat dissipation of the heat cut from the heater block from being transmitted to the Teflon hose through the brass coupling tube as much as possible because the heat dissipation is made together in the housing and the heater block. has the effect of being maintained as

1 is a perspective view showing a state in which the nozzle structure for a 3D printer of the present invention is combined with a heater block;
2 is a cross-sectional view showing the nozzle structure for a 3D printer of the present invention,
3 is a cross-sectional view showing the configuration of a nozzle in the nozzle structure for a 3D printer of the present invention;
4 is a perspective view showing the configuration of the supply member in the nozzle structure for a 3D printer of the present invention.

Hereinafter, the nozzle structure for a 3D printer of the present invention will be described in detail.

In the nozzle structure for 3D printer of the present invention, the nozzle 10 including the nozzle body 11 to which the brass coupling pipe 12 to which the Teflon hose 13 is coupled to the inside is coupled is coupled to the supply member and supplied from the heater block. It is characterized in that it is installed in a 3D printer so that the filament can be melted by the heat to be molded.

A nozzle structure for a 3D printer of the present invention having the above characteristics will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a nozzle structure for a 3D printer of the present invention, FIG. 2 is a view showing the configuration of a housing having a second heat dissipation hole in the nozzle structure for a 3D printer of the present invention, and FIG. 3 is a 3D printer of the present invention It is a view showing a state in which the nozzle and the heater block are combined, and FIG. 4 is a view showing the cross-sectional configuration of FIG. 3 .

Referring to FIGS. 1 to 4 , the nozzle structure for a 3D printer according to the present invention includes a nozzle 10 , a supply member 20 , and a heater block 30 .

The nozzle 10 has a nozzle body 11 that melts filaments by the heat of the heater block 30 to form a molded product, and an inclined contact surface 12a so that there is no gap while being in complete contact with the nozzle body 11 . ) and the brass coupling pipe 12 to which the Teflon hose 13 is coupled, and the brass coupling pipe 12 to prevent expansion by the heat transferred from the heater block 30, the coupling is only up to the step formed on the inside of the brass coupling pipe 12. It consists of a Teflon hose 13 to which the filament is supplied.

In addition, the nozzle body 11 is formed with an inclined surface (unsigned) on the inside to achieve complete adhesion when combined with the brass coupling tube 12 .

And the brass coupling pipe 12 is formed with an inclined contact surface 22a in close contact with the inclined surface of the nozzle body to prevent the filament molten by the heater block 30 from flowing in.

The supply member 20 has a housing 21 configured so that the nozzle body 11 can be detached, and the housing 21 has a Teflon hose 13 that is expanded by heat transmitted from the heater block 30. A first heat dissipation hole 21a and a second heat dissipation hole 21b are formed to prevent the heat dissipation.

'자 형상으로 이루어져 히터블럭(30)의 상부쪽으로 연결된다. The first heat dissipation hole (21a) is the heat dissipation of the heat cut from the heater block (30) is made together in the housing (21) and the heater block (30) is transmitted to the Teflon hose (13) through the brass coupling pipe (12) In order to block as much as possible, the housing 21 and the heater block 30 have a '

It is made in a 'shape and is connected to the upper part of the heater block (30).

'자 형태로 형성하는 것은 히터블럭(30)으로부터 전단되는 열의 방열이 하우징(21)과 히터블럭(30)에서 같이 이루어져 황동결합관(12)을 통해 테프론호스(13)로 전달되는 것을 최대한 차단한다.The first heat dissipation hole (21a) '

Forming in a 'shape is as much as possible that the heat dissipation of the heat sheared from the heater block 30 is made together in the housing 21 and the heater block 30, and is transmitted to the Teflon hose 13 through the brass coupling pipe 12. do.

In addition, a second heat dissipation hole 21b is formed in the housing 21 , and the second heat dissipation hole 21b dissipates heat transferred from the heater block 30 to transfer heat to the Teflon hose 13 . block as much as possible.

The operation of the nozzle structure for a 3D printer of the present invention configured as described above will be described.

First, the brass coupling pipe 12 to which the Teflon hose 13 is coupled is inserted into the upper part of the nozzle body 11 and screwed, and the housing 21 of the supply member 20 in a state coupled to the noble body 11. Press into the inside of the to fix the screw.

In a state in which the brass coupling pipe 12 to which the Teflon hose 13 is coupled, and the nozzle body 11 are coupled to the housing 21 of the supply member 20, the heater block 30 is coupled to the nozzle body, and the filament flows in. It is installed in the 3D printing device so that it can be melted by the heat of the heater block 30 and sprayed into the nozzle 10 .

When the filament supplied from the reel is introduced in the state of being installed in the 3D printing device, the filament is melted in the nozzle body 11 by the heat of the heater block 30, and the molten filament is sprayed.

When the filament is melted by the heat of the heater block 30, the Teflon hose 13 serving as the filament supply pipe is located at a distance from the end of the brass coupling pipe 12, so the heat of the heater block 30 It is not transmitted to the Teflon hose 13, so the phenomenon of expansion or bursting by heat is prevented.

In addition, since the first heat dissipation hole 21a is formed to be extended to the housing 21 and the heater block 30, the heat cut from the heater block 30 is transferred to the Teflon hose 13 through the brass coupling pipe 12. not transmitted

'자 형상으로 제1방열공(21a)으로 히터블럭(30)의 방열이 이루어짐으로서 과도하게 온도가 상승되는 것을 막는다.Blocking of this heat is provided in the housing 21 and the heater block 30.

By dissipating the heat of the heater block 30 through the first heat dissipation hole 21a in a 'shape, excessive temperature rise is prevented.

And since heat is also radiated through the second heat dissipation hole 21b formed in the housing, the heat cut from the heater block 30 is blocked from being transmitted to the Teflon hose 13 through the brass coupling tube 12 .

As described above, since heat is dissipated in the first heat dissipation hole 21a and the second heat dissipation hole 21b, excessive heat transfer to the Teflon hose 13 inserted inside the brass coupling tube 12 is prevented, so Teflon The hose 13 is expanded by heat to prevent bursting.

In addition, since the present invention has an inclined contact surface 12a formed at the lower portion of the brass coupling pipe 12, the nozzle 10 and the brass coupling pipe 12 are coupled by screw coupling, so that a solid coupling is made, so that a conventional nozzle and brass There is an effect of solving the problem that the molten filament flows into the gap due to the occurrence of a gap between the coupling pipe.

In addition, the present invention blocks the heat dissipation of the heat cut from the heater block 30 from being transmitted to the Teflon hose 13 through the brass coupling pipe 12 as much as possible by making the housing 21 and the heater block 30 together. There is an effect of maintaining an appropriate temperature while preventing the temperature from rising excessively by the heat of the block 30 .

While this specification contains numerous specific implementation details, they should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features that may be specific to particular embodiments of the particular invention. should be understood

On the other hand, the embodiments of the present invention disclosed in the present specification and drawings are merely presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It will be apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical idea of the present invention can be implemented in addition to the embodiments disclosed herein.

10: nozzle
11: Nozzle body
12(22): Brass coupling tube
12a (22a): inclined contact surface
13(23): Teflon Hose
20: supply member
21: housing
21a: first heat dissipation hole
21b: second heat dissipation hole
30: heater block

Claims (4)

Teflon hose 23 and the brass coupling pipe 12 is coupled nozzle 10 and;
Including a supply member 20 to which the nozzle is detachably coupled,
It is easy to replace the nozzle 10 as well as to prevent the phenomenon of expansion and bursting by the heat supplied from the heater block 30,
In the supply member 20, a first heat dissipation hole 21a and a second heat dissipation hole 21b are formed to prevent the Teflon hose 13 from being expanded by the heat transferred from the heater block,
The first heat dissipation hole (21a) is the heat dissipation of the heat cut from the heater block (30) is made together in the housing (21) and the heater block (30) is transmitted to the Teflon hose (13) through the brass coupling pipe (12) The housing 21 and the heater block 30 have a '

It is made in a 'shape and is connected to the upper part of the heater block (30),
The second heat dissipation hole (21b) is a nozzle structure for a 3D printer, characterized in that the heat transferred from the heater block (30) is dissipated to block the heat transfer to the Teflon hose (13).
According to claim 1,
The nozzle 10 is
a nozzle body 11 for molding a molded article by melting the filament by the heat of the heater block 30;
A brass coupling pipe 12 to which the Teflon hose 13 is coupled and having an inclined contact surface 12a so that a gap is not generated while the nozzle body 11 is completely attached;
Teflon hose 13 to which the filament is supplied by coupling only up to the step formed on the inside of the brass coupling pipe 12 to prevent expansion of the pipe by the heat transmitted from the heater block 30;
A nozzle structure for a 3D printer, characterized in that it comprises a.
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